prepare to release 0.3

Ignore-this: 6b847455a0aa2fb7fef6833480006155

darcs-hash:20131017015626-3a4db-3e6f6de680de03c86538aec45fb1a7c2f45d8ff9
start development of 0.4

Ignore-this: 754300c8ccfec2a1434d1dfee306f8d

darcs-hash:20131017015800-3a4db-959cee6e80445edf228a88e41e0d7b5d142c5b64